Re-pair Achieves High-Order Entropy
Re-pair Achieves High-Order Entropy
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修复实现高阶熵
DOI:
10.1109/dcc.2008.79
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发表时间:
2008
期刊:
影响因子:
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通讯作者:
L. Russo
中科院分区:
文献类型:
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作者:
G. Navarro;L. Russo
Re-pair is a dictionary-based compression method invented in 1999 by J. Larsson and A. Moffat [Off-line dictionary-based compression. Proc. IEEE, 88(11):1722-1732, 2000], lacking up to now an efficiency analysis. We show that re-pair compresses a sequence T[1,n] over an alphabet of size sigma to at most 2nHk + o(n log sigma) bits, for any k = o(logsigma n), where Hk is either the classical information-theory or the empirical k-th order entropy (in the latter, the model is inferred from the sequence statistics).